How to use the pymtp.LIBMTP_Playlist function in PyMTP

list.
		"""
		if (self.tracks == None):
			self.tracks = ctypes.pointer(ctypes.c_uint32(0))

		self.no_tracks += 1
		self.tracks[(self.no_tracks - 1)] = value

	def __len__(self):
		"""
			This returns the number of tracks in the playlist
		"""

		return self.no_tracks

LIBMTP_Playlist._fields_ = [("playlist_id", ctypes.c_uint32),
                            ("parent_id", ctypes.c_uint32),
                            ("storage_id", ctypes.c_uint32),
                            ("name", ctypes.c_char_p),
                            ("tracks", ctypes.POINTER(ctypes.c_uint32)),
                            ("no_tracks", ctypes.c_uint32),
                            ("next", ctypes.POINTER(LIBMTP_Playlist))]

class LIBMTP_Folder(ctypes.Structure):
	"""
		LIBMTP_Folder
		Contains the ctypes structure for LIBMTP_folder_t
	"""

	def __repr__(self):
		return "%s (%s)" % (self.name, self.folder_id)

# ----------
# Type Definitions
# ----------
 
_libmtp.LIBMTP_Get_Friendlyname.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Serialnumber.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Modelname.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Manufacturername.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Deviceversion.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Filelisting_With_Callback.restype = ctypes.POINTER(LIBMTP_File)
_libmtp.LIBMTP_Get_Tracklisting_With_Callback.restype = ctypes.POINTER(LIBMTP_Track)
_libmtp.LIBMTP_Get_Filetype_Description.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Filemetadata.restype = ctypes.POINTER(LIBMTP_File)
_libmtp.LIBMTP_Get_Trackmetadata.restype = ctypes.POINTER(LIBMTP_Track)
_libmtp.LIBMTP_Get_First_Device.restype = ctypes.POINTER(LIBMTP_MTPDevice)
_libmtp.LIBMTP_Get_Playlist_List.restype = ctypes.POINTER(LIBMTP_Playlist)
_libmtp.LIBMTP_Get_Playlist.restype = ctypes.POINTER(LIBMTP_Playlist)
_libmtp.LIBMTP_Get_Folder_List.restype = ctypes.POINTER(LIBMTP_Folder)
_libmtp.LIBMTP_Find_Folder.restype = ctypes.POINTER(LIBMTP_Folder)
_libmtp.LIBMTP_Get_Errorstack.restype = ctypes.POINTER(LIBMTP_Error)
# This is for callbacks with the type of LIBMTP_progressfunc_t
Progressfunc = ctypes.CFUNCTYPE(ctypes.c_void_p, ctypes.c_uint64, ctypes.c_uint64)

# ----------
# End Type Definitions
# ----------

class MTP:
	"""
		The MTP object 
		This is the main wrapper around libmtp
	"""